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Can A Plastic Shed Base Be Installed Directly Onto Concrete?

A very common question that we asked her at the Shed Base Company: "Can I install my plastic shed base directly on top of my existing concrete flooring?" To answer simply, yes. In this article we will be going over why you can install your fully recycled plastic base on top of your existing floor and how it is beneficial.

Why Install Onto Concrete?

In some cases, people may already have a concrete base or flooring in place where they wish to install their new base and shed. It will more than likely cost more or be far more labour intensive to remove the hardscaped area before even starting to install your base.

You may be wondering why not just install on the concrete? Well, concrete holds any rain or other water that it comes into contact with which can lead to your shed absorbing the liquid and eventually rotting. By using our fully recycled plastic base, your shed is kept off the ground and away from the non-permeable concrete floor. Your shed is given room to breathe and avoid moisture to prolong its life and make sure you do not have to go out and buy a new shed any time soon.

Plastic Shed Base Installed Straight Onto Concrete Image
Plastic Shed Base Installed Straight Onto Concrete Image 1
Plastic Shed Base Installed Straight Onto Concrete Image 1

How Should I Install My Base?

There are a few ways of installing your new plastic shed base on to your existing concrete flooring. Although similar, they do include different products and vary in the amount of steps required.

Method 1 (The Quickest):

  1.  Clear your concrete base and ensure it is level,
  2. Install your new plastic shed base directly on to the concrete,
  3. (Optional) Fill your base with up to 20mm gravel,
  4. Install your new shed on top of your plastic base.

Method 2 (As seen in previous blogs):

  1. Clear your concrete flooring and ensure it is as flat as possible,
  2. (Optional) Lay a sheet of shed base membrane over the concrete surface,
  3. Install your plastic shed base on top of the membrane,
  4. (Optional) Fill your now installed base with up to 20mm gravel,
  5. Install your garden building on top of your new base.

Method 3:

  1. Clear your concrete surface and ensure it is as level as possible,
  2. Create a perimeter using edging products to help contain the sand and stop any movement of your base,
  3. (Optional) Lay a sheet of shed base membrane,
  4. On top of the membrane or concrete lay a small layer of sand before compacting and levelling as well as you can,
  5. Once the sand level, install your new plastic shed base,
  6. (Optional) fill your plastic base with gravel up to 20mm,
  7. Install your new garden building on your new base.


As you can see, installing our plastic shed base which will prolong your sheds life is not a difficult task and is more than worth the little extra work. You can browse our full range of shed foundations on our shop site.

We hope this blog has answered any questions you may have regarding the installation of our fully recycled plastic shed bases on top of existing concrete flooring. However if you do have any questions then please do not hesitate to contact us.

Plastic Shed Base Installed Straight Onto Concrete Image 2
Plastic Shed Base Installed Straight Onto Concrete Image 2

10 Replies to “Can A Plastic Shed Base Be Installed Directly Onto Concrete?

  1. Hi, I already have a metal shed which has been placed on top of a concrete base without any damp proof (previous owner). I’d like to damp proof to keep bikes in there without rusting. If I went for the method of damp proof layer, plastic shed base, 20mm of gravel, wooden sheets and then the metal shed would this stop condensation?

    1. This sounds like a good build-up and would certainly help to mitigate the amount of moisture rising from below, but whether it will completely eliminate condensation I’m not sure.

    1. Yes, the product is strong enough to take the weight of a car. I would recommend looking at our sister website The Garden Range to look at how this product is used to create a gravel or grassed driveway. You can see the product by visiting The Garden Range – Gravel Driveway

  2. Does concrete provide any advantageous as a bottom layer, compared with placing the plastic and membrane directly on the ground? I’m awaiting my new shed and have 9 concrete flags in place. It would be just as easy to retain them as a bottom layer or to get rid of them, so I’d love to know which you’d actually recommend?

    1. The disadvantage of using concrete as the sub-base beneath the grid would be that you would lose permeability below the grid. If the grid is laid on a permeable free draining hardcore, water is free to permeate underneath the grid and will not form puddles.

      The benefit of using the slabs would be that you will have a nice solid base, provided they’re sound and stable. If there’s substantial gaps between the slabs, this should also help to combat the potential puddling issue.

  3. hello. i’ve got a car port. to access it I need to drive over loads of waterlogged mud. i’m thinking try to level it, then pour stone chips & cover this with your grids. good idea?

      1. Hi, I’ve just moved into my new property the previous owner left a rotten shed(5×7), I’ve got rid of this shed but I’ve purchased a summerhouse (11×7). What would be the best way to raise the extra area needed before placing the plastic bases down ? The extra area needed its currently soil. Could I place gravel or crush to get the area all level ? Then place my plastic bases and fill then build the summer house.
        Complete novice when comes to gardening and DIY. Thanks

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